Shipworks at http://shipworks.com/ works wiith eBay, Amazon and hopefully, CS-Cart. We do all of our order fullfullment from Shipworks for both Amazon and eBay, including shipworks automatically uploading all of the shipping, feedback and order fulfilled information. It also wonderfully intergrated with Stamps, Endicia and others. All fulfillment/shipping/email to customer/dropshippers are quick and easy. Thanks, Stephen